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Compound semiconductor photocatalyst, preparation method of the compound semiconductor photocatalyst, photocatalytic system comprising the compound semiconductor photocatalyst, and hydrogen preparation method

A photocatalyst, semiconductor technology, applied in the field of catalysis

Active Publication Date: 2013-05-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] But so far, there are no patents and literature reports using quantum dots sensitized TiO 2 And cheap cobalt, nickel, iron and other transition metal salts or complexes under mild conditions, using visible light to drive the reformation of biomass derivatives and generate hydrogen

Method used

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  • Compound semiconductor photocatalyst, preparation method of the compound semiconductor photocatalyst, photocatalytic system comprising the compound semiconductor photocatalyst, and hydrogen preparation method
  • Compound semiconductor photocatalyst, preparation method of the compound semiconductor photocatalyst, photocatalytic system comprising the compound semiconductor photocatalyst, and hydrogen preparation method
  • Compound semiconductor photocatalyst, preparation method of the compound semiconductor photocatalyst, photocatalytic system comprising the compound semiconductor photocatalyst, and hydrogen preparation method

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Embodiment 1

[0116] A method for reforming biomass derivatives and producing hydrogen with a photocatalytic system containing a composite semiconductor photocatalyst, comprising the following steps:

[0117] Add 10 mg P-25 TiO to the Pyrex tube 2 , 5ml of cadmium selenide quantum dots (the concentration of CdSe quantum dot stock solution is based on the concentration of cadmium ions, and the concentration of cadmium ions=1×10 -3 mol / L), adjust the pH to 11 with 1mol / L sodium hydroxide, centrifuge, remove the supernatant, and keep the precipitate; then add 0.5ml cobalt dichloride aqueous solution (original concentration 4.2×10 -3 mol / L, containing 0.5mg cobalt dichloride hexahydrate), 4ml methanol (original concentration 24.75mol / L, 20°C), 1M NaOH to adjust pH=11 and make the total volume constant to 10ml, making it in a sealed nitrogen atmosphere In the atmosphere, irradiate the test tube with a 500W high-pressure mercury lamp (400nm long-pass glass filter).

[0118] Methanol is an impor...

Embodiment 2

[0121] A method for reforming biomass derivatives and producing hydrogen with a photocatalytic system containing a composite semiconductor photocatalyst, comprising the following steps:

[0122] Add 10 mg P-25 TiO to the Pyrex tube 2 , 5ml of cadmium selenide quantum dots (the concentration of CdSe quantum dot stock solution is based on the concentration of cadmium ions, and the concentration of cadmium ions=1×10 -3 mol / L), adjust the pH to 11 with 1mol / L sodium hydroxide, centrifuge, remove the supernatant, and keep the precipitate; then add 0.5ml cobalt dichloride aqueous solution (original concentration 4.2×10 -3 mol / L containing 0.5mg cobalt dichloride hexahydrate), 4ml ethanol (original concentration 17.16mol / L, 20°C), 1M NaOH to adjust pH=11 and make the total volume to 10ml, so that it is in a sealed nitrogen atmosphere , irradiate the test tube with a 500W high-pressure mercury lamp (400nm long-pass glass filter).

[0123] Figure 8 In this embodiment, CdSe quantum ...

Embodiment 3

[0130] A method for reforming biomass derivatives and producing hydrogen with a photocatalytic system containing a composite semiconductor photocatalyst, comprising the following steps:

[0131] Add 10 mg P-25 TiO to the Pyrex tube 2 , 5ml of cadmium selenide quantum dots (the concentration of CdSe quantum dot stock solution is based on the concentration of cadmium ions, and the concentration of cadmium ions=1×10 -3mol / L), adjust the pH to 11 with 1mol / L sodium hydroxide, centrifuge, remove the supernatant, and keep the precipitate; then add 0.5ml cobalt dichloride aqueous solution (original concentration 4.2×10 -3 mol / L containing 0.5mg cobalt dichloride hexahydrate), 4ml sucrose aqueous solution (original concentration 0.25mol / L, 20°C), 1M NaOH to adjust pH=11 and make the total volume constant to 10ml, making it in a sealed nitrogen atmosphere In the atmosphere, irradiate the test tube with a 500W high-pressure mercury lamp (400nm long-pass glass filter).

[0132] During ...

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Abstract

The invention discloses a compound semiconductor photocatalyst, a preparation method of the compound semiconductor photocatalyst, a photocatalytic system comprising the compound semiconductor photocatalyst, and a hydrogen preparation method. According to the invention, quantum dots are adsorbed on the surface of TiO2 as a carrier by mercaptopropionic acid on surfaces of the quantum dots; a Co, Ni or Fe salt or its complex is assembled to the surfaces of the quantum dots in a photic driving in-situ growth way in the presence of biomass derivatives so that the compound semiconductor photocatalyst is obtained; and simultaneously, the biomass derivatives are reformed and hydrogen is produced. The preparation method of the compound semiconductor photocatalyst fast and simply realizes TiO2 sensitization by CdTe, CdSe or CdS, and realizes preparation of the compound semiconductor photocatalyst having high efficiency under visible light driving. The hydrogen preparation method realizes biomass derivative reforming and hydrogen preparation. The preparation method of the compound semiconductor photocatalyst does not need a template or an initiator. The compound semiconductor photocatalyst is efficient, stable and cheap and does not need further separation purification. According to the invention, harsh conditions such as calcining are not needed and precious metals such as Pt and Rh as cocatalysts are not adopted; reactions are efficient; operation is simple; and a cost is low and practicability is obtained.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a composite semiconductor photocatalyst, a preparation method thereof, a photocatalytic system containing the catalyst and a method for preparing hydrogen. Background technique [0002] Energy is an important material basis for human survival and development, and it is also the driving force behind various economic activities and an important indicator of the level of social and economic development. At present, the energy for human survival and development mainly comes from oil and natural gas. On the one hand, the oil crisis that began in the 1970s made people gradually realize the non-renewability of fossil energy, especially oil and gas resources, which will face depletion in the foreseeable future, and there will be sharp price fluctuations before they are on the verge of depletion ; Therefore, the development of new energy sources must be accelerated. On the other hand,...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J27/043B01J37/34C01B3/32
Inventor 吴骊珠李治军李旭兵李嘉欣
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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